这是一个从句的省略问题。
在这里是可以的。从语法的角度讲sb think that+( )括号里面的是宾语从句,用that来引导,这里的that要不要不影响到句子的意义,所以可以省。但是有的地方that是万万不能省去的。
比如:That he passed the exam was a fable!(他能及格简直是神话!)
可以
认为,以为[that)
We thought it our duty to take care of the orphans.
我们认为照顾这些孤儿是我们的职责。
They thought the novel worth reading.
他们认为这本小说值得一读。
I think he will come.
我想他会来的。
宾语从句that可以省略,可以的。
可以
比如
I think (that) he is a fool.
He think (that) this is a good present.
可以
I think you are wrong.
He thinks it will rain later.